OP ARTS AND SCIENCES. 51 



the resemblance of the herbage to that of Petasites {Nardosmia) pal- 

 mata, the generic name here applied suggests its likeness to the 

 original Cacalia of Touruefort, and in part of Linnceus, which is 

 Adenostyhs of Cassini. 



Cacalia, L. Gen. ed. 4, 362 (excl. his own Kleinia, Porophyllum, 

 Vaill., and Tournefort's Cacalia, which is Adenostyles). Cacalia 

 (chiefly) and Psacalium, DC. I cannot think that the homogamous 

 white-flowered Senecionece with deeply-cleft corollas, which Lin- 

 nteus referred to Cacalia — and which, after restoring Kleinia, L., 

 DeCandolle properly made the staple of that genus — should be 

 combined with Senecio. The genus seems to be quite as good as 

 Emilia, Notonia, Gynura, and some others which have been kept up. 

 In view of the vastness of Senecio, it were better to limit it even some- 

 what arbitrarily, and, as in the analogous case of Asteroidece, to make 

 use of color ; which on the whole coiricides with habit, and also with 

 geographical distribution. Cacalia essentially belongs to Central and 

 North America and to Northern Asia. Only the following are more 

 or less known to me by specimens : — 



§ 1. N. E. Asian, with one North American species : corolla-lobes 

 only half the length of the throat. 



C. HASTATA, L., and some other species with still fewer-flowered 

 paniculate heads. It is probably by a mistake that C. hastata has 

 been attributed to Sitka or any part of North America. Specimens 

 of the plant so referred by the Russian botanists, collected on Sitka, 

 prove to belong to Prenanthes hastata, the Sonchus hastatus of Lessing, 

 Nabalus alatus. Hook. Fl. Bor. Am. i. 294, t. 102. 



C. SUAVEOLENS, L., of Eastern North America, with many-flow- 

 ered cymosely disposed heads. 



C. ACONiTiFOLiA, Miq. (Syueilesis, Max.), with cymose heads. 



§ 2. Atlantic North American species with cymosely disposed about 

 • 5-flowered heads : corolla-lobes very much longer than the throat, 

 i. e. limb 5-parted: receptacle commonly with one or two fleshy 

 fimbrilljE projecting from the centre. — § Conophora, DC. 

 * Leaves pedately-nerved. 



C. RENiFORMis, Muhl. iu Willd. Spec. PI. 



C. ATRiPLiciFOLiA, L. Doubtless includes G. gigantea, Nees «fe 

 Schauer. 



C. DivERSiFOLiA, Torr. & Gray. Perhaps only a form of the 

 foregoing ; but the corolla-lobes are only moderately longer than the 

 campanulate throat. 



